Reference
Reference
Look-it-up tables — the full reason-code vocabulary, every policy field, and the shared type contract.
The flat, scannable lookups.
MCP server
The agent's install — @veto-protocol/mcp adds the buyer-side checkout flow as MCP tools so an agent in Claude, Cursor, or Continue can transact against any protocol-speaking merchant.
Reason codes
The complete, stable rejection vocabulary. Every rejection (and several accepts) carries one or more of these SCREAMING_SNAKE_CASE codes — a stable API surface an agent keys off.